While plunderer can be played by only one class, javelin is in all decks right now, at least at competitive level.
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the meta will need time to come out with counter, disciple of aldmor, sword gobbler, blackened heart, wizent's prayer, procured and restored, cards either immune to SE ability or can break the weapon recycling should see more play
Eye of the Dark Forest should be in top of the list, that card is equivalent to 5-6 cc card, second one would be Gemstone Javelin